Heel



FIG. 1 is a rear, side perspective view of a heel showing my new design;

FIG. 2 is a rear, bottom, side perspective view thereof;

FIG. 3 is another side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is another side view thereof; and,

FIG. 6 is a rear view thereof.

The broken lines shown in the drawings of a shoe form no part of the claimed design.

All surfaces not shown form no part of the claimed design. 

CLAIM The ornamental design for a heel, as shown and described. 